三、It作主语的句型
1. It takes sb. to do（=sb takesto do）某人用多长时间做某事
例 It took the men a week to mend our roof.（= The men took a week to mend our roof.）
2. It's（just）（un）like sb. to do（不）像某人做某事的'风格
例 It was（just）like him to think of helping us.
3. It's（about/high）time that should /v-ed是该做某事的时候了
例 It's（about/high）time that we should take action.
4. It's the x-th time（that） have v-ed第几次做某事了
例 It's the third time that he has failed the driving test.
5. It is/has been since continuous v-ed（延续性动词）某动作已有多长时间不发生了
例 It's 10 years that he lived here
6. It was（not） before过（不）了多长时间某动作发生了
例 It was not long before they arrived.
